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Related Experiment Videos

The study of macromolecular complexes by quantitative proteomics.

Jeffrey A Ranish1, Eugene C Yi, Deena M Leslie

  • 1Institute for Systems Biology, 1441 North 34th Street, Seattle, Washington 98103-8904, USA.

Nature Genetics
|February 19, 2003
PubMed
Summary

Researchers developed a new method using isotope-coded affinity tags (ICAT) and mass spectrometry to identify protein complex components and quantify their abundance changes. This technique aids in analyzing complex biological machinery.

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Area of Science:

  • Proteomics
  • Molecular Biology
  • Biochemistry

Background:

  • Protein complexes are crucial for cellular functions.
  • Identifying and quantifying protein complexes is challenging.
  • Existing methods lack comprehensive analysis of complex composition and abundance.

Purpose of the Study:

  • To present a generic strategy for determining protein complex composition and abundance.
  • To apply this strategy to analyze RNA polymerase II preinitiation complex (PIC) and STE12 protein complexes.
  • To provide researchers with advanced tools for macromolecular complex analysis.

Main Methods:

  • Utilizing isotope-coded affinity tag (ICAT) reagents.
  • Employing mass spectrometry for quantitative peptide analysis.

Related Experiment Videos

  • Comparing relative abundances of tryptic peptides from purified protein complexes.

    • Main Results:

    • Successfully distinguished genuine protein components of the RNA polymerase II PIC from contaminants.
    • Detected quantitative changes in the abundance of STE12 protein complexes.
    • Identified dynamic changes in the composition of protein complexes in yeast cells.

    Conclusions:

    • The developed strategy offers a powerful approach for comprehensive analysis of protein complexes.
    • Quantitative mass spectrometry guides identification and quantification of complex components.
    • This method enhances the understanding of macromolecular complex dynamics and composition.